Chapter 150 — How man arrives at eternity as to consummation

We showed in an earlier chapter that the idea of eternity follows from unchangeability. For as motion causes time, in which priority and posteriority are discerned, so the cessation of motion puts a stop to priority and posteriority; and so there is left the idea of eternity, which is simultaneously whole. Therefore, in his final consummation man attains eternity of life, not only in the sense that he lives immortally in his soul, which the rational soul has by its nature, as was shown above, but also in the sense that he is brought to perfect unchangeability.